Catalytic cracking additives
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Everyone, I would like to ask whether there are any other types of catalytic cracking units besides the four types mentioned: single-stage regeneration with high and low sections in parallel, two-stage regeneration with high and low sections in parallel, and coaxial regeneration Why cannot carbon monoxide be used as an oxidizing agent in two-stage regeneration with high and low pressures? Is more platinum or more palladium used as an oxidizer these days? For the platinum oxidizer used in all these devices, is it also necessary to add a certain amount at the first use, and then supplement more based on the low temperature rise during regeneration? Is there a manual for the addition and use of oxidizers?
There are multiple points where PT is used as an oxidizing agent; PT has a strong capability for both oxidation and denitration, but above 600°C it only serves as an oxidizing agent. The combustion-promoting effect of Pb is weaker than that of Pt at temperatures above 600°C. However, Pb has a strong ability to activate basic nitrogen and can be used as an oxidizing agent for denitration ； There are two ways of adding the agent: it can be mixed with the main catalyst and added before starting up ； A dedicated catalyst feed line is used for addition; the second approach involves establishing a reserve as quickly as possible, which generally accounts for 1-3% of the regenerative system’s capacity. This process usually takes one month, with the level reaching 1.0-1.5 within the first ten days, after which the addition is done more slowly. After establishing the reserve amount, the daily replenishment amount should be 1.0–2.0% of the amount of new catalyst added